Electrothermostatic alarm system.



A. GOLDSTBIN. 'BLECTEOTHBRMOSTATI ALARM SYSTEM.

APPLICATION E'ILED AUS. 1910.

Patented Mar. 14,1911.

ummum 1| mmm! WDM/0450,02

- i G are constructed. alike, so that ALBERT GoLDe'rniN, or Nnw Yonx, N.Y., AssiGNon ro mrnimiia'romin ELECTRIC PROTEOTIO COMPANY, A CORPORATIONOF EW YORK.

ELECTROTH'ERMOSTATIC ALARM SYSTEN' specification of Letters Patent.

Patentea Mar. 114, 1911;

Application filed August 6, 1910. Serial No. 575,899.

a Toial 'wii/om, it may concem':

-Be it known that I', ALBERT GoLDs'riiiN, a citizen of the UnitedStates, residing at New York, in the county of New York and State of NewYork, have inventedl acertain new and useful ,I'inprovement inElectrothervmostatic Alarm Systems, of: which the following is aspecification.

system, whereby The invention relates to an electro-thermostatic alarmsystem, whereby upon a rise in temperature at` any station of a numberof stations, an audible alarm is sounded both at said' station and at a'central oflice.

Tlie invention further consists in the applicat'ion of said' system toan ordinary bell both systems derive energy from the same source andutilize the same main conductors' The accompanying' di'awing. exhibitsmy system and shows the station alarm apparat-us and the central oflicealarm apparat'us i'espectively in longitudinal cross section.

1 is a central battery or other suitable source of currentI`` iiicircuit with which is a bell 2 and push buttons 3, 4, located at theseveral distant st'ations. Said stat-ions may, for example, be rooms ina hotel, in which case, t'he hell 2 would be located at t-he olice-t-hearrangeinent .being that' of' the ordinary hell system in common use, to

.which Without change 'my alarm system is here shown as applied. IIneach room I provide an electro-thermostatic alarm as and 6. At thecentral ofiice I ,providea receiving ala-rm 7. Theroom alarms 5 and adescription of one applies to all. The construction 'of said room alarm(which is fully set o ut and clainied in another application'for-Letters Patent, Serial No. 575,901, .filedsimultaneously 'herewithI and therefore is not her'ein claimed) is as .followsz The device isattached to a wall or 'ceiling A. B is a hollow cylindrical 'ca-sing ofiron, having a partition C; -To the under or outer side of the artitionis secured the electro-magneticoilP'D, 'having a tubular pole piece E.Through the coilgand pole piece'passes the brass rod F, whichis'connected. at its lower end'to a boss ,Glen asheet iron diaphragm Hsecured to the outer open. end of the' casing. The' inner or 'upper endof rocl F eirtendsthrough the leaf spring I, above which it'is---`headed. lSaid spring is secured at one lend ,toalug on thepartition C;

' ciently to permit the from is a contact J which bears against thespring I'. The inner or upper end'of casing .B is closed by a partitionK, upon which is v,mounted a ldia-phragm L made L' per` as thin as'possible.-

of Sheet cop- Between the diapliragm L and the partition K is formcd aMoiiiited on part/ition Ciout insulated there- ,i

chamber Ma In the partition K is aii air vent N. On the outer side ofthe diaphragm is disposed' acontact carried by aleaf spring O which issecured to a ring P of insulat-ing material, which ring' i'ests againstthe wall or ceiling when the apparatus is secured thereto by means ofscrews, as shown at Q. Outside of the diaphragm H and preferablysecui'ed to the casing by the scre'ws which attach said diaphragmthei'eto is a frusto-conical cap R, upon which is mounted the flangedinner half of the annular air chamber S. The outer half of said Chamber'is fianged to fit upon the inner half. vThe walls of said Chamber arepreferably made of sheet copper as 'thin a's practi'cable. The interiorof said Chamber is connected to 'the Chamber M by means of a 'metal tube'T, which, as here shown, passes outside ofthe .casing and through.thewall thereof and through the partition K. The placing of' tube 'Toutside of the casing is not essential, since it may obviously bedisposed within the same in any suitable way. A' metal horn U having ashoulder V is seatedl at its -smaller end inthe circular space inclosedthe anni'ilar air Chamber S.

The operation vis as follows: Vhen the atmosphere surrounding chamber Sbecomes heated and the air .in said Chamber 'ex'pands at. a rate inexcess of that determined by the size of the rent N, the diaphi'agm L israised to meet the contact carried by spring O. Circuit is thenestablished from main .circuit Wire a, to`coil D,

.tocontact J, spring I, caing B, diaphragm L, contact and spring O, and'so to main Circuit Wire 7). The magnet, however, in

'raisiu'g dia-phragm H,`lifts rod F and so permits spring-I to riise,thus causing circuit to he broken between contact v I, with the resultthat said diaphragm is' set iii'rapid vibration, producing a loudaudible J and spring alarm which is amplified by the horn U.

This' ,alarm continuessounding until the. 'temperature of the atmospherefalls suiiig diaphragm L to break Circuit with spring The central otiicealarm 7 comprises a cup-shaped casing S, closed above by a metaldiaphragm and containing an electro-magnet coil 10, connected inthe mainconductor Z). Sccurcd to the casing in front of the diaphragm is a soundamplifying horn 11.

The operation of the whole system is as follows: l'V hen an)I one ofthe' room alarms is set. in operation by an increase in temperature, inthe mauner already described,`

a frequency is im posed upon the current on the main conductors, so thatthe attraction of the magnet 10 in casing 8 isintermittently exerted ondiaphragm 9, causing the same to vibrate and to produce an audibleala-rm which is amplitied by horn 11. It is thcrefore to be noted-l.That, upon rise of atn'iosphcric temperature at any distant stationas,for example, in any room of a hotel-an audible alarm is sounded both inthat room to warn the occupant, and in the central or hotel oflice towarn the people' 1. The combination in circuit of (1)4 vmeans fornnultaneously producing a frequency current and an alarm, and a. Circuitcloser in shunt With said means; and (2) at a distant. station, twoalarm devices, one of said devices being responsive and the otherirresponsive tosaid frequency current.

The combination in circuit, and (l) at each of a` plurality ofsub-stations, of

means for.simulta.neously producing a frequency current and an alarm,and a circuit closer in shunt with said means; and (2) at a distantstation, two alarm devices, one of said devices being responsive to thefrequency current; from any one of said Substations and the other devicebeing irresponsive to said frequency current.

3. A fire alarm appafratus comprising the combination in circuit of (1)means for simult-aneously producing' acertain frequency current and analarm, and a thermostat controll'ing said means; and (2) at a' distantstation, an alarm device responsiv'e only to said frequency current.

et. The combination in Circuit, and (1) at each of a pluralityof'sub-stations, of means for simultaneoush1 producing a frequencycurrent and an alarm, al circuit'closer in shunt with said means, and athermosta-t controlling said meansland ata distant central station, twoalarm devices, one' of said devices being responsive to the frequencyYcurrent from any one of said substations and the other device beingirresponsite to said frequency current.

The combination of a plurality of electro-magnetieally operated devices,each producing a frequency current, and an audible alarm signal, and aplurality of Circuit closing` sn'itches connected in parallel across amain line, and, in series in said line, a battery, an audible alarmproducing device responsive to 'said frequency current, and' an audiblealarm producing device not responsive to said frequency current.

In testiinony Whereof I have aflixed my .signature in presence oftwowitnesse's.

ALBERT GoLDsTEIN.

Witnesses Gi'm'rnron ,'l`. Pon'rnn, Mai' T. McG-Anny.

